Satish Balay via petsc-dev <petsc-dev@mcs.anl.gov> writes: > This is likely a dependency of a dependency.
Jeff, you can apt install --no-install-recommends petsc-dev The recommendation comes from libopenmpi-dev: https://packages.debian.org/buster/libopenmpi-dev I'd estimate an exceedingly small fraction of libopenmpi-dev users actually use coarray Fortran so the recommendation might be wishful thinking from Alastair.
